Building door unit



FIG. 1 is a perspective view of a building door unit incorporating the new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a cross-sectional view thereof taken along the line 5--5 of FIG. 1; and

FIG. 6 is a cross-sectional view thereof taken along the line 6--6 of FIG. 1. 

The ornamental design for a building door unit, substantially as shown and described. 